Reference Index ¶
Maybe the upgrade of the reference index isn’t run proper.
Probably the cause are “broken” links: the internal syntax of TYPO3 for links is changed.
The manual of the Organiser (EXT:org) provides some SQL statements for analysing trouble with the link syntax.
Please refer to
- Upgrades > TYPO3 7.6 > 8.7 > Extensions > Linkhandler